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Clarke, who has now lost three of his first four games, said: "I don't like losing games, I don't like losing games heavily, so we have to address that in the next four games.

"It's not always about building, I'm not going to experiment in the next four games. I don't have to experiment, I have to work with the players who are at my disposal and I have to try and make us better and certainly more resilient defensively."

Clarke was hugely frustrated at the manner of the three first-half goals.

Romelu Lukaku opened the scoring after Belgium counter-attacked through a wide open Scotland rearguard, and then Thomas Vermaelen and Toby Alderweireld headed home following corners.

Scotland are now fifth in Group I after the loss (Image: Action Images via Reuters/Lee Smith)

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"We shot ourselves in the foot in the first half from our set play, 10 seconds later we are 1-0 down after nine minutes," he said.

"It was a decent nine minutes, we started on the front foot again and pressed well, but then we have been heavily punished from two corner kicks.

"We spoke before the game, when you play against a team of Belgium's quality, who are capable of scoring from open play, it's almost imperative that you don't concede from set-pieces and from three set-pieces we find ourselves 3-0 down, having played some good football in the first half.

"Even at 1-0 we didn't buckle, we stayed strong, tried to press and move the ball, but it's very difficult to try and sell positives when you have lost 4-0 at home."

Kevin De Bruyne provided three assists and scored Belgium's final goal (Image: ROBERT PERRY/EPA-EFE/REX)